Brake.



No. 795,099. 'PATE-NTED JULY is, 1905. G.,E.F.BURNLEY.

BRAKE.

APPLIOATION FILED 1330.23. 1904.

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' WITNfSSES' INVEN-TOR /zazlesflfflurnley ANDREW n GRAHAM on, menu mloclw'ums wuum'mn n u PATENTED JULY 18, 1905. G. E. P. BURNLBY.

BRAKE.

APPLIOATION FILED nmzs. 1904.

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TTNITED STATES Patented July 18, 1905.

PATENT trio 1.

BRAKE.

SPECIFICATION forming part of Letters Patent No. 795,099, dated July 18, 1905.

Application filed December 23, 1904. Serial No. 238,089.

To all whom it may concern:

Be it known that 1, CHARLES E. F. BURN- LEY, a subject of the King of Great Britain, and a resident of Eckman, in the county of McDowell and State of West Virginia, have invented a new and ImprovedBrake, of which the following is a full, clear, and-exact description.

My invention relates to brakes, and more particularly to those adapted for ,use upon such vehicles as mine-cars.

It has for its principal objects the provision of a simple and efiicient device of this character.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the views.

Figure 1 is a side elevation of a car to which one embodiment of my invention is applied. Fig. 2 is a partial bottom plan view thereof. Fig. 3 is an enlarged transverse sectional detail on the line 3 3 of Fig. 1, and Fig. 4 is an enlarged detail in bottom plan.

My invention is illustrated in connection with a mine-car, which comprises a main frame A, side walls B, supported by uprights C, and opposite pairs of flanged wheels D D. Upon the opposite side walls adjacent to the forward wheel are fixed pivot-pins 10, conveniently by means of base-plates 11, and upon each of these pins is fulcrumed a lever 12, carrying a pivoted brake-shoe 13 for coaction with said forward wheels. Articulated to the lower end of each lever is a link-section 14, preferably threaded at its outer end for connection with a second section 15, which may include opposite side bars connected by a yoke at 16, containing a threaded opening through which the section 14 operates. The second link-section may thus be rotated upon the first to vary the length of the member and the sections locked in the desired position by a nut 17, which may be turned into contact with the yoke at its outer side. Pivotally connected with the outer extremities of the sections 15 are a lever 18 and a link 19, supported by a rod or shaft 20, which is bodily movable longitudinally of the car in ways formed in brackets 21, supported beneath the main frame. This rod, just inside the links 18 and 19, carries brake-shoes 22 22, which are free to turn upon the rod and which contact with the rear wheels. The lever 18 is joined atits upper end 23 by a connecting-rod 24 to a hand-lever 25, conveniently mounted upon a link 26, attached to the frame of the car near its rear. This hand-lever, as illustrated, extends through a slot 27 in the overhanging side wall and is operable from within the car as well as from the outside. The connection between the rod 24 and the lever may be through a pin 28, cooperating with a longitudinal series of openings 29 in the rod, this permitting the relation of the elements to be varied.

Each of the brake-shoes is preferably provided with a recess 30,0pcrating over the flange of the coacting wheel, the depth of this recess and the extension of the flange being sufficient to maintain the parts in engagement when the brakes are off, and thus at all times preventing lateral displacement, the shoes being kept in correct alinement with the faces of the wheels. As the pins 10, from which the levers of the forward brake-shoe are hung, are carried by the sides of the car, which under heavy loads are liable to bulge, it is desirable to provide means whereby their movement shall be permitted without transmission to the shoes. In the present instance this is accomplished by leaving some length of pin at the inner side of each lever, which enables it to play through the lever-opening without materially affecting the lever itself or its shoe.

l/Vhen brakes are mounted upon hangers supported upon fixed pivots, they must be constructed with extreme accuracy to secure an equal pressure upon both the front and rear wheels, and even then this will continue only so long as the wear upon the shoes is identical, which is a condition not possible to attain in practice. Therefore one pair of shoes wears more than the other, and the power applied is expended upon the least-worn pair and upon the hangers, with the companion shoes having little or no friction upon the wheels. in my improved brake the links 14 15 having first been adjusted to bring both pairs of shoes into the proper relation with'the wheels when the hand-lever is moved to apply the brakes the lever 23 swings simultaneously about both the shaft 20 and its pivotal connection with the sectional link as fulcrums, the latter pivot also acting to transmit the force to the forward shoe, while the former applies it to the rear shoe. In doing this the shaft shifts in its brackets, allowing the shoes to bear upon the wheels with equal force, this continuing until all the shoes are worn out. As substantially all the parts of the brake except the hand-lever and its connecting-rod are situated between the wheels and axles they are effectually protected and danger of injury is slight, since there are no projecting parts to be struck.

Having thus described my invention, Iclaim as new and desire to secure by Letters Patent 1. The combination with a vehicle having at each side pairs of wheels, of a lever fulcrumed upon the vehicle, a link articulated to the lever, a lever pivoted upon the link, a bracket fixed to the vehicle, a fulcrum-shafthaving a bearing in the bracket and being freely movable therein and upon which the last-named lever may swing, and a brake-shoe mounted upon the shaft. I l

2. The combination with a vehicle having at each side pairs of wheels, of levers fulcrumed upon the vehicle at opposite sides, a link articulated to each lever, a shaft extending across and being movable longitudinally of the vehicle, a link connecting the first-named link with one endof the shaft, a lever fulcrumed upon the shaft and being joined to the opposite link.,. and brake-shoes carried by each of the first-named levers and by the shaft.

3. The combination with a wheeled vehicle comprising a main frame and sides carried thereby and movable relatively to the main frame, of a pivot-pin fixed to said sides, a lever fulcrumed upon the pin, a brake-shoe carried by the lever, and means for preventing the brake-shoe moving laterally of the wheel.

I. The combination with a wheeled vehicle comprising a main frame and sides carried thereby,"of a pivot-pin fixed upon said sides, a lever fulcrumed upon the pin and being capable of longitudinal play thereon, and a brake-shoe carried by the lever and having a recess into which a portion of a vehicle-wheel extends. 

